Electric heater



S. M-. AND. J. H. CARMEAN.

ELECTRIC HEATER.

APPLICATION FILED SEPT.-12,I92I. I

Patented May 23, 1922..

2 SHEETSSHEET I.

3 vmwntow Samue/ M 64/72/1940, uhmea 1% 64/77/64,

s. AND. J. H. CARMEAN.

ELECTRIC HEATER.

- I APPLICATION FILED SEPT. 12, 1921. 1,416,688. Patented May 23, 1922.

2 SHEETSSHEET 2.

51 noentow 50/7711 M [fir/776w. James hf. Car/226a.

attomneu UNITED STATES PATENT OFFICE.

SAMUEL M. CLARMEAN AND JAMES H. CARMEAN, OF KANSAS CITY, MISSOURI.

ELECTRIC HEATER.

Application filed September 12, 1921.

T 0 all whom it may concern Be it known that we, SAMUEL M. CAR- MEAN andJAMES H. CARMEAN, citizens of the United States, residing at KansasCity, in the county of Jackson and State of Missouri, have inventedcertain new and useful Improvements in Electric Heaters; and we dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the figures of reference marked thereon,which form a part of this specification. This invention relates toelectric heaters and particularly to that class of electric heaters inwhich an impeller or fan is employed for directing air over heatingelements before expelling it from the heater casing, the heating elementand fan or impeller preferably having separate circuits so that the fancan be operated whether the heater is energized or not.

The primary object of the invention is to provide a device of the classdescribed in which the parts can be easily constructed and readilyassembled, this being an important feature of the invention because thecost of assembly of such a device is an import-ant factor in themanufacturing cost, and the commercial success not infrequently dependsupon the selling price, which is largely controlled by the cost ofproduction.

It will, therefore, be apparent that a de vice which will functionefliciently andwhich can be assembled easily so that the productive costcan be cut down to a minimum is a material advance in the art and whilethe invention has certain inherent virtues due to the structuralembodiments of certain of the parts, the main object is to provide animproved electric heater at a minimum cost. 4

The other advantages, as well as the novel details of construction bywhich the desired results may be obtained, will be apparent byreference'to the following description in connection with theaccompanying drawin s, in which ig. 1 is a perspective disassociatedview of the various parts ready to be assembled,

and

Fig. 2 is a cross-sectional View through Specification of LettersPatent.

Patented May 23, 1922.

Serial No. 499,976.

base 1 preferably carries the switch 3 by which the circuits may be madeand broken.

The top of the tubular base member 1 has offset edges 4 and 5 with ears6 and 7 to receive bolts or other fastening devices for securing thehousing 8 to the base. The housing is provided with a rear tubularportion 9, having an inbent edge flange 10 to be hereinafter referredto, and the part 9 is connected to an enlarged tubular portion 11 by avertical web 12, which constitutes a shoulder 13 against which certainof the elements may abut.

At the forward end of the tubular portion 11 is a peripheral flange 14,connecting the bell-shaped discharge end 15 as will be clearly apparentby reference to Fig. 1.

The casing may be constructed of a single spinning or stamping of sheetmetal so that it may be produced at a minimum cost, and the casing maybe fastened to the base 1 by suitable bolts or screws which pass throughthe openings 16 and 17 in the tubular portions 9 and 11. The inbentflange 10 constitutes a support or wall for a screen 18, which may restagainst it and be secured by the shouldered ring 19-connected to theends of the spider arms 20. The shouldered ring 19 is slightly recessed,as shown in Fig. 1, so that it will receive the screen 18 and when it issecured to the flange by suitable fastening devices which pass throughthe openings 21 in the ring and 22 in the flange 10, the screen 18 willbe held in place.

The screen 18 is provided with an opening 23, through which the boss 24of the gland 25 on the spider projects, the boss constituting a spacingmeans for spacing the im eller fan 26 away from the rear of the casing8. The gland is internally threaded, as at 27, to receive-the threadedend 28 of the motor casing 29, the shaft 30 being on an armature androtatable within the threaded portion 28 so that it may rotate the fanwhile the casing 29 is held stationary by the gland 25. The gland 25 issecured to the ring 19 by spokes or spider arms 20' and the ringpreferably carries a handle 31 by which the heater may be transported.It will be seen, therefore, that the impeller, the motor and the screen,can be readily assembled in a convenient manner.

The shoulder 13 constitutes an abutment for the heating element. Thiselement is shown as consisting of a plurality of radial flat blades 82,secured together by fastening devices 33 in any well known manner andsupporting the heating element or filament 34, which may be threadedthrough the openings in the blades 32 in themanner shown, so that acomplete unitary heating structure may be provided.

There is a heater casing provided for the heater and it is shown asconsisting of a sheet 35 which may be bent in the form of a horseshoewith a plurality of grooves 36 struck up transversely of the sheet toreceive the ends 37 of the heater blades 32 so that the blades can beslipped into the grooves 36 and then the heater casing introduced intothe casing 8 with the rear edge 38 bearing against the shoulder 13, thewidth of the casing 35 being substantially equal to the length of thetubular portion 11 so that when it is in place, it will be held by thescreen 39, which may abut against the shoulder formed by the flange lland be secured to the flange by the ring it) by means of fasteningdevices, such as suitable bolts or screws.

When the ring 40 clamps the screen 39 against the shoulder 14:, it willbe apparent that any longitudinal movement of the casing will beeliminated because the casing will. in turn, be clamped between theshoulder 13 and the screen 39.

The grooved portions 36 are out-struck from the sheet so that they formspacing members to hold the major portion of the sheet away from theinner wall of the casing 8, thereby providing dead air spaces betweenthe coil casing and the casing 8 and since the heat is generated withinthe coil casing, it will be apparent that the dead air spaces will actas insulating spaces to prevent the casing 8 from becoming undulyheated.

The coil casing 35 could be made as a continuous ring but it may beconveniently formed as shown because it can be constructed of sheetmetal with struck-up ribs at the spacing portions 35 and thenappropriate lengths cut off and bent, as shown in Fig. 1, theconstruction being simple and conveniently arranged so that the partscan b expeditiously and efficiently assembled within the heater casing 8from one end. the motor, the'screen and motor support being fastened tothe casing 8 from the opposite end; thus expediting the assembling ofthe parts and insuring an eflicient construction of electric heatingdevice or air impeller, dependent upon whether or not the heater isenergized.

From the foregoing it will be apparent that the device may beinexpensively constructed, quickly assembled and that the cost ofmanufacture will be reduced to a minimum.

\Vhat we claim and desire to secure by Letters-Patent is 1. An electricheater comprising a casing having an open end, a shoulder near the rearend of the casing, an impeller between the shoulder and the rear end ofthe casing, an electric heating member bearing against the shoulder, ashoulder at the front end of the casing, and a coil-retaining meansconnected to the second mentioned shoulder.

2. An electric heater comprising a casing having an open end, animpeller at one end of the casing, a shoulder on the casing in front ofthe impeller, an electric heating member having one end bearing againstthe shoulder, and a ring at one end of the easing and confining theelectric heating member within the casing.

3. An electric heater comprising a casing having stepped offset portionsproviding shoulders, an impeller between one shoulder and one end of thecasing, an electric heating member within the casing and bearing againstone of the shoulders, and an electricheating-member-retaining elementcarried by the other shoulder to retain the electric heating memberwithin the casing.

4. An electric heater comprising a casing, an impeller within saidcasing, an electric heating element comprising radial blades withheating coil supported thereby, a heating coil case surrounding theelectric blades and having blade-receiving grooves extending outwardlyfrom the case to provide an insulating space between the coil case andthe electric heater ease, and means for securing the case and coilwithin the casing.

An electric heater comprising a casing having a shoulder intermediateits ends, an impeller between the shoulder and one end of the casing, ashoulder at the opposite end of th casing, a heating element comprisingradial blades with heating coils carried thereby, a coil casesurrounding the blades and having out-struck portions forming spacingribs and provided with grooves to receive the ends of the blades, theblades and coil case abutting against the first named shoulder, and aring secured to the second mentioned shoulder to prevent longitudinalmovement of the blades and coil case with respect to the electric heatercasing.

(3. An electric heater comprising a casing having a plurality of otl'settubular portions to provide shoulders, a spider at one end of thecasing. a screen clamped between the spider and one end of the casing. amotor carried by the casing and having a shaft extending thereinto, animpeller on the shaft, an electric heater comprising radial blades withcoils carried thereby, the blades resting against one of the shoulders,and means secured to the other shoulder for holding the electric heateragainst longitudinal movement with respect to the casing.

7. An electric heater comprising a casing having a plurality of offsettubular portions to provide shoulders, a spider at one end of thecasing, a screen clamped between the spider and one end of the casing, amotor carried by the casing and having a shaft extending thereinto, animpeller on the shaft,

1 an electrlc heater comprising radial blades with coils carriedthereby, the blades resting against one of the shoulders, means securedto the other shoulder for holding the electric heater againstlongitudinal movement with respect to the casing, and a coilcase'supporting the blades and having outstanding spacing ribs to-spacethe major portion of the coil case away from the electric heater casingto provide an insulating space.

In,testimony whereof we aflix our signatures.

SAMUEL M. CARMEAN. JAMES H. CABMEAN.

